Consistent link color for Bevy supporters section

Edit: The links the the donation section on the home page use the browser-default color, instead of the Bevy themed one.

~~The link "The Quick Start Guide" is `rgb(124, 144, 255)`, while the link "abledbody" is `rgb(140, 140, 255)`. Should these be made the same color, since they are both links?~~

~~(Also weirdly enough the blue of "abledbody" shows up as a dark blue on my phone, likely due to an Apple shader. This is what helped me catch the different colors.)~~

Start at the home page donation section and inspect how the links "The Quick Start Guide" and "abledbody" receive their colors. Make the links use the same Bevy-themed color, then verify the result on the home page and at the affected viewport sizes shown in the issue images.

Written by the indexing model from the issue text.